Empirical and Molecular Formula Worksheet - Answer Key

 

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  1. What is a molecular formula?

    The molecular formula is the actual formula of a compound. 

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  2. What is an empirical formula?

    An empirical formula is the most reduced ratio of atoms in a compound. 

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  3. How do you convert from the empirical to the molecular formula?

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    Divide the mass of the molecular formula by the mass of the empirical formula.  Use the resulting number as a multiplier.

     

     

  4. Terephthalic acid contains C, H and O.  Combustion of 19.81 mg terephthalic acid produces 41.98 mg CO2 and 6.45 mg H2O.  If 0.250 mol of terephthalic acid has a mass of 41.5g, determine the molecular formula of terephthalic acid.

    C8H6O4

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